51191300 has 36 divisors (see below), whose sum is σ = 111399120. Its totient is φ = 20418720.

The previous prime is 51191299. The next prime is 51191303. The reversal of 51191300 is 319115.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (51191303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61487 + ... + 62313.

It is an arithmetic number, because the mean of its divisors is an integer number (3094420).

Almost surely, 2^51191300 is an apocalyptic number.

51191300 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51191300 is an abundant number, since it is smaller than the sum of its proper divisors (60207820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51191300 is a wasteful number, since it uses less digits than its factorization.

51191300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460 (or 1453 counting only the distinct ones).

The product of its (nonzero) digits is 135, while the sum is 20.

The square root of 51191300 is about 7154.8095711906. The cubic root of 51191300 is about 371.3060732982.

The spelling of 51191300 in words is "fifty-one million, one hundred ninety-one thousand, three hundred".